When your check engine light is lit,obd diag & scan, and what should you do, ask for a mechanic for help? You can use an OBD 2 scanner tools to diagnose the problem yourself as well as give you solutions to repair it. OBD 2 scanner tools can also make you understand whether your car will pass an emissions test,car code reader. The following will introduce the there types of tool,canobd2 diagnostic tool. Dash Dyno Dash Dyno is an in-car installed device. It links to your car's OBD 2 diagnostic port, which is under the dashboard. Dash Dyno can measure your car's fuel economy and horsepower. It can also diagnose your check engine light. Dyno Dash supplies free software updates. This software has a user interface,bluetooth obd2 scan tool, which is made of an eight-button back-lit keyboard and menus. Dash Dyno lets you see your data in different ways, such as bar and line graphs. Auto Enginuity Scan Tool Auto Enginuity Scan Tool is an OBD 2 tool that works with the PC, Pocket PC or Palm. This tool can read real-time sensors of car, such as fuel adaptation, ignition timing advance and wide-band oxygen sensors and so on. The tool can also show real-time data and run systems tests. One of the benefits of using this software tool is that it will provide the data whether your car will fail or pass an emissions test. Auto Enginuity supports Universal Serial Bus (USB) 2.0 and cars such as Land Rover, Chrysler,obd scan bluetooth, Porsche, Mercedes, Toyota and General Motors and so on. Auto Enginuity is also available in other languages,barcode scanner, such as German, Spanish and Japanese. Auto Tap Express DIY Auto Tap Express DIY is 2 scanner software that is used for whom want to DIY. Auto Tap Express "links the special OBD 2 plug in port under your dash of your car or light truck to your computer." Auto Tap Express can identify the reasons of your check engine light illuminated, as well as diagnose and repair other frequent engine problems. It can also decide whether your car will pass an emissions test. This software tool can supply you snapshots of your car, permitting you to monitor how your engine implements over time. Auto Tap Express enables you to see the data in graph form and supports Windows operating systems, containing 2000, XP,http://www2s.biglobe.ne.jp/~lethal/i-no/cgi-bin/joyful/joyful.cgi, Vista and win 7. There are a lot of online stores over the internet; you can find that what you need online.